Osg 1065100 Straight Flute Tap 2-56 Unc Plug Hss

Product Description

The OSG 1065100 is a straight flute tap designed for cutting internal 2-56 UNC threads in a range of ferrous and non-ferrous materials. Built from high-speed steel with a bright, uncoated finish, this tap features 2 flutes and a plug chamfer that assists with thread starting and chip evacuation in through-hole and shallow blind-hole applications. The overall length is 1.75 inches with a thread length of 7/16 inches. The H2 thread limit provides controlled oversize for reliable fit within the 2B class of fit tolerance. Licensed machinists, tool and die makers, and maintenance technicians typically specify this tap for small-diameter precision threading work.

This tap is suited for tapping 2-56 UNC threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The plug chamfer makes it appropriate for through-holes and blind holes with sufficient depth for chip clearance. Its compact 1.75-inch overall length fits standard tap wrenches and machine tool holders used in bench work, drill press setups, and CNC tapping cycles where small-diameter threads are required.

Key Features

• 2-56 UNC thread form with 56 threads per inch for small-diameter precision applications
• Plug chamfer for easy thread starting in through-holes and adequate-depth blind holes
• High-speed steel construction provides durability across a broad range of workpiece materials
• H2 thread limit ensures consistent 2B class of fit tolerances
• Right-hand thread direction, standard for the majority of fastener applications
• Bright uncoated finish suitable for general-purpose use without lubricity coating requirements

Compatibility

Designed as a straight flute plug tap for cutting 2-56 UNC internal threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. Part of OSG Series 104.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with tapping operations. Always ensure the workpiece is securely fixtured and the tap is aligned perpendicular to the hole before applying torque. Use an appropriate cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread quality. Inspect the tap for wear or damage before each use, as small-diameter taps are susceptible to breakage if forced or run misaligned.